GREELEY, Colo. (AP) -An investigator testified Friday he found no blood inside or outside the car of a backup punter charged with attempted murder in a knife attack on the starter.Mitch Cozad is accused of stabbing Rafael Mendoza in his kicking leg last Sept. 11 when they were teammates at Northern Colorado. Police and prosecutors allege Cozad attacked Mendoza in hopes of taking over the starter's job.Cozad, of Wheatland, Wyo., is on trial on charges of attempted first-degree murder and second-degree assault and could face 48 years in prison if convicted.His attorney has said another student attacked Mendoza.Jan LeMay, a criminalist with a Greeley forensics lab, said Friday his tests found no blood on Cozad's Dodge Charger.A witness testified earlier that a car - later identified by authorities as the Charger - had stopped outside a liquor store the night of the attack and two men dressed in black got out and stripped tape off the license plates.On Thursday, Mendoza testified he once considered sharing his apartment with Cozad. He also repeated his earlier assertion that he could not identify his attacker because only the assailant's eyes were visible beneath the cinched-up hood of a black sweat shirt.``It wasn't Mitchell Cozad, was it?'' asked Joseph Gavaldon, Cozad's attorney.``I couldn't tell you that,'' Mendoza replied.Former police detective Angela Quinn testified that she found two pairs of black shoes, four black shirts and a black sweat shirt with a hood that had white stripes down the sleeves during a Sept. 14 search of Cozad's room.Mendoza has said his attacker was dressed all in black. The witness who reported seeing the two men peel tape off the Charger's license plate, Kyle Oakeson, said they were dressed in black.Before jurors left for the day, they sent a note to Judge Marcelo Kopcow asking him to ask Quinn whether Mendoza or Oakeson mentioned white stripes down the arm of a black hooded sweat shirt.``No,'' Quinn answered.

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